Lua string.match pattern for MSN weatherservice

Question

I use the MSN weatherservice. Now I have the following problem with string.match. All variables are filled except sWindRichtung. It equals nil.

sHumidity, rest = string.match(rest,"humidity=\"([^\"]+)\"(.*)");
sWind, rest = string.match(rest,"windspeed=\"([^\"]+)\"(.*)");
sWindRichtung, rest = string.match(rest,"winddisplay=\"([^\"]+)\"(.*)");

The string to filter is: humidity="77" winddisplay="11 km/uur N" windspeed="11"

I think that the character / is the problem.

The problem is that you're parse assumes a certain field order. After parsing `windspeed` nothing comes after it and so `rest` is an empty string. — greatwolf, Nov 25 '13 at 21:33

score 5 · Answer 1 · answered Nov 25 '13 at 16:40

5

You can parse the string in one go. Try this:

s = [[
humidity="77" winddisplay="11 km/uur N" windspeed="11"
]]

for k,v in s:gmatch('(%a+)="(.-)"') do
        print(k,v)
end

Of course, you may want to save the values in a table.

answered Nov 25 '13 at 16:40

lhf

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Lua string.match pattern for MSN weatherservice

1 Answers1